Telephone hook-switch.



No. 704,697. Patented July :5, 1902.

w. w. DEAN. TELEPHONE HOOK SWITCH.

(Application filed may 9, 1901.

(No Model.) 2 Sheats8heet i.

HEM PW. 3144mm.

CFQZ wvmcww w. Um

w: Nnnms mace. Puma-Limo. WASMINBIQN. n. c.

No. 704,697. Patented .Iuly I5, 1902. w. w. DEAN.

TELEPHONE HOOK SWITCH.

(Application filed. May 9, 1901.)

(No Model.) 2 Sheets-Sheet 2.

I Tm; annals msns cq. mmu'ma, wnsmmn'dn. mic.

UNITED STATES PATENT OFFICE.

WILLIAM W. DEAN, OF CHICAGO, ILLINOIS, ASSIGNOR TO KELLOGG SlIVITCH- BOARD AND SUPPLY COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION O F ILLIN OIS.

TELEPHONE HOOK-SWITCH.

SPECIFICATION forming part of Letters Patent No. 704,697, dated July 15, 1902.

Application filed May 9, 1901. Serial No. 59,474. (No model.)

To all whom it may concern:

Be it known that I, WILLIAM W DEAN, a citizen of the United States, residing at Chicago, in the county of Cook, State of Illinois,

have invented new and useful Improvements in Telephone Hook-Switches, (Case No. 37,) of which the following is a specification.

My invention relates to improvements in apparatus used at subscribers stations in to telephone systems, and has particular reference to that part of the apparatus known as the hook-switch. Such apparatus commonly includes a pivoted hook, upon the free end of which the receiver is adapted tobe nor- [5 mally hung and which when the receiver is removed for talking serves to foperate the switch-springs located adjacent the hook to change the circuits through the apparatus from normal or ringing condition to talking 2o condition, the reverse operation taking place upon the restoration of the receiver to the hook. A spring device is also provided of sufficient strength to lift the hook when it is relieved of the weight of the receiver and to cause it to shift the spring-contacts operated by the hook. A box or cover is usually provided for the protection of these parts and only the, free end of the hook is allowed to project outside of the same. It has been the common practice to mount the several parts comprising the switch upon the back board or base of the subscribers instrument or uponthe inside of the box or cover. It has also been common to mount the hook upon one part and the springs upon another andin other inconvenient and disjointed relations. Such methods of mounting them are troublesome, as well as expensive, and require great care in locating and adjusting the parts. Any slight variation from the proper location is liable to cause the assembled device to work inefficiently,while any change occurring after installation, as by the shrinking, swelling, or warping of the woodwork, may cause an entire failure of the apparatus. It has also been usualto include the hook and its lifting-spring in the circuits involved in talking and ringing; but in such arrangements the objectionable electrical contact of the pivot-joint of the hook and that between the I hook and the spring occur either in the talking or ringing circuit. My invention seeks to avoid these difficulties by embodying in a single compact structure the working parts of the switch, whereby is obtained an eflicient and durable device which is convenient to install and always remains in adjustment.

The invention further consists of the novel details of construction and combinations of parts hereinafter fully described, and particularly pointed out in the appended claims, reference being had to the accompanying drawings, forming a part hereof, in which the same reference characters designate like parts throughout the several views, and in which I the instrument.

As stated above, the support for the hookswitch may be secured to the backboard or base of the instrument or to the inside of the cover in any convenient way. As shown in Fig. 1, the part to which it is attached is designated by the numeral 2 and constitutes the backboard or base of the instrument. The support,which is preferablya casting of brass or composition, comprises in this instance a foot or base 3, which is suitably apertured for the screws 4, passing through the back piece 2 and threading thereinto to hold the same in position. From the pedestal or foot the standard 5 projects outwardly and is provided at its outer end with the hook-supportin g means, consisting, preferably, of two pivot lugs or cars 6, between which the telephone-hook 7 is pivoted upon the pin 8, so as to oscillate in a vertical plane, said-hook extending through a slot in the cover, which serves to limit its movement in both directions. A forwardly and outwardly projecting ledge 9 is formed integrally with one of the pivot ears or lugs 6, upon the upper face of which and parallel with the hook the fiat switch-springs l0 and hook-lever "pivoted upon said standard, a group of circuit-changingcontact-springs and alternately disposed insulating material, means for securing said group of springs together, said means also serving to clamp said group of springs to the support, one of said springs projecting beyond the others, and a lug upon the switch-hook to engage'said projecting spring to change the set from signaling to talking position, and vice versa, in the operation of the. hook, substantially as described.

3. In a telephone hook-switch,the combination with a metallic support, of a hook-lever pivoted upon said support, a group of circuitchanging contact-springs and alternately-disposed insulating material, screws for securing said springs and strips together and to said support, said springs'adapted to be operated by said hook-lever, and a lifting-spring for said hook-lever, the electric circuits being completed through said contact-springs independently of the lever and lifting-spring, substantially as described.

4. In a telephone hookswitch,the combination with a metallic support, provided with pivot-ears and a ledge at one side of said ears, of a hook-lever pivoted in said ears and carryingaslotted lug,switch-springs mounted upon said ledge parallel with said hook and having their free ends adjacent said lug, one of said springs being longer than the others and extending into the slot of said lug, Wherebythe springs are changed from signaling to talking positions, and vice versa, by the operation of the hook, substantially as described.

5. In a telephone hook-switch,the combination with a metallic support, of a hook-lever pivoted upon said support,a ledge on said support, a plurality of superimposed switch-contact springs, with insulating-strips therebetween mounted upon said ledge, a readily-removable means to clamp and bind said springs and strips in place whereby their number may be readily varied, one of said springs being extended to engage the telephone hook to change them from signaling to talking position and vice versa in the operation of the hook, substantially as described.

6. In a telephone hook-switch,the combination with a metallic support, of a hook-lever pivoted upon said support, a group of circuit-- changing contact-springs and alternately-disposed insulating material directly mounted upon said support,and adapted to be operated by the hook, and a lifting-spring secured to said support and adapted to lift the said hooklever, substantially as described.

7. In a telephone hook-switch,the combination with a metallic support provided with ledges, of a hook-lever pivoted upon said support, a set of switch-springs mounted upon one of said ledges and adapted to lie alongside the hook-lever and to be operated thereby to change the circuits from talking to signaling positions, and vice versa, and a leaf-spring secured at one end to the other led go and enpoint between the pivot and free end of the lever, substantially as described.

9.- In a telephone hook-switch, the combination with a single integral support, of a hooklever pivoted. upon said support, a group of circuit-changing contact -springs and'alternately-disposed insulating material directly mounted upon said support, said lever being arranged to operate said springs from a point between the'pivot and free end of the lever, substantially as described.

10. In a telephone hook-switch, the combination with a single integral support, of a hook-lever pivoted upon said support,a group of circuitchanging contact-springs and alternately -disposed insulating material directly mounted upon said support and out of the plane of vibration of the hook-lever, and means for operating said springs by said hooklever, substantially as described.

11. In a telephone hoolr-switch, the combination with a single integral metallic support, of a hook-lever pivoted thereto, a group of circuit-changing contact-springs also mounted upon said support and out of the plane of vibration of the hook-lever, and .means for changing said springs from one position to another by the hook,substantiall y as described.

12. In a telephone hook-switch, the combination with a support, of ahook-lever pivoted thereto, a group of circuit-changing contactsprings mounted upon said support out of the plane of vibration of said lever, and means connected with the lever between its pivot and free end for operating said springs, substantially as described.

13. In a telephone hook switch, the combination with a support, of a hook-lever pivoted thereto, a group of circuit-changing contactsprings mounted upon said support at the side of said lever and extending substantially parallel thereto, and means connected with the lever between its pivot and free end for operating said springs, substantially as described.

IIO

14:. Ina telephone hook-switch, the combination with a metallic support, of a hooklever pivoted upon said support, a group of circuit changing contact springs and altermeans for securing said group of springs together, said means also serving to clamp said group of springs to the support, one of said springs projecting beyond the others and adapted to engage the switch-hook whereby the springs are positively moved from talking to signaling position, and vice versa, by the hook, substantially as described.

16. In a telephone hook-switch, the combination with a metallic supporting-standard,of a hook-lever pivoted upon said standard, a group of circuit-changing contact-springs and alternately disposed insulating material, means for securing said group of springs together, said means also serving to clamp said group of springs to the support, one of said springs projecting beyond the others, said hook being adapted to transversely engage said projecting spring to change the group from one position to another in the operation of the hook, substantially as described.

17. In a telephone hook-switch, the'combination with a single integral metallic support, of a hook-lever pivoted upon said support, a group of circuit-changing contact-springs and alternately-disposed insulating material directly mounted upon said support, and means for changing said springs from signaling position to talking position, and vice versa, controlledby thehook,substantiallyas described.

18. In a telephone hook-switch, the combination with a single integral metallic support, of a hook-lever pivoted upon said support, a group of circuit-changing contact-springs and alternately-disposed insulating material directly mounted upon said support, and means tending to cause said lever to rise, said springs being controlled by the hook, substantially as described.

19. In a telephone hook-switch, the combination with a metallic supporting-standard,of a hook-lever pivoted upon said standard, a group of circuit-chau ging contact-springs and alternatelydisposed insulating material, means for securing said group of springs together, said means also serving to clamp said group of springs to the support, one of said springs projecting beyond the others, a projection upon the hook to engage said projecting spring to control the set in changing from signaling to talking position, and vice versa, and means to exert an upward spring-pressure upon the hoolgsiibstantially as described.

20. In a telephone hook-switch, the combination with a support, ofahook-lever pivoted upon said support, a group of circuit-changing contact-springs and alternately-disposed insulating material directly mounted upon said support and extending substantially parallel with the switch-hook lever, said group of springs being out of the plane of vibration of the hook-lever, and means for operating said springs by the hook-lever, substantially as described.

21. In a telephone hook-switch, the combination with a metallic support, of a hook-lever pivoted upon said support, a group of circuit changing contact springs and alternately-disposed insulating material directly mounted upon said support, and independent means tending to cause said lever to rise, said springs being controlled by the hook, substantially as described.

In witness whereof I hereunto subscribe my name in the presence of two witnesses.

XVILLIAM l/V. DEAN.

Witnesses:

KEMPSTER B. MILLER, LEROY D. KELLOGG. 

